Authors: Albertsen, J. Z.; Grong, Ø.; Mathiesen, R. H.; Schmid, B.

Source: Corrosion Engineering, Science and Technology, Volume 40, Number 3, September 2005 , pp. 239-243(5)

Publisher: Maney Publishing

Abstract:

In the present investigation, metallurgical characterisation of the nickel-based superalloy Nicrofer 602CA has been carried out following field exposure at approximately 540°C for 2 years. In general, the Nicrofer 602CA alloy is found to exhibit a high intrinsic resistance to metal dusting corrosion under the prevailing circumstances. Only a thin zone is affected by carbon intrusion, extending about 20 ?m from the surface and into the bulk of the material. The subsequent field emission gun scanning electron microscope and synchrotron X-ray diffraction analyses of the exposed Nicrofer 602CA alloy revealed the presence of various phases at the corroded surface, including nepheline (NaAlSiO₄) and presumably also corundum (Al_2?xCr_xO₃). None of these oxide phases are commonly observed in connection with metal dusting corrosion. It is believed that the nepheline phase forms as a result of reactions between corundum and the substances Na and SiO(g) transported to the surface by the syngas.

Keywords: NICKEL-BASED ALLOYS; ELECTRON MICROSCOPY; PHASE IDENTIFICATION; METAL DUSTING CORROSION; X-RAY DIFFRACTION

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174327805X66290

Publication date: 2005-09-01

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